Reversible thermostatic system



Nov. 19, 1935. c OTTO REVERSIBLE THERMOSTATIC SYSTEM Filed Oct. 5, 1952 2 Sheets-Sheet 1 Ndv. 19, 1935. c. A. OTTO 2,021,263

REVERSIBLE THERMOSTATIC SYSTEM Filed Oct. 5, 1932 2 Sheets-Sheet 2' 3rwemo1.

Gttomegs Patented Nov. 19, 1935 UNITED STATES REVERSIBLE THERMOSTATIC SYSTEM Carl A. Otto, Milwaukee, Wis., assignor to Johnson Service Company, Milwaukee, Wis., a corporation of Wisconsin Application October 5,

Claims.

This invention relates to temperature control, and particularly to the control of heat exchange systems which at times operate to heat and at other times operate to cool roomsor other enclosed spaces.

In certain systems of this character, radiators are used in the various rooms, and the system is operated, according to conditions at difierent times to circulate a heating medium or a cooling medium through these radiators. The radiator valves in heating systems are commonly controlled by thermostats, there being a thermostat in each room which controls the' valve or valves controlling one or more radiators in that room. In a heating system the thermostat must close the valve on rising temperature and open it on falling temperature, but in a cooling system this action must be reversed. It is also desirable that the thermostats function to maintain two some- What difierent uniform temperatures under the two conditions specified.

The purpose of the. present invention is to provide a thermostatic'control system in which a single thermostatic installation will control radiator valves in either of the two, relatively reversed relations, and if desired may operate to scribed as applied to pneumatic thermostat sysmaintain diiierent temperatures according to the operative characteristics of the heat exchange system at the time; and in which the thermostatic control system as a whole may be set from a central point to operate in either of the two characteristically different modes above specified.

The invention is susceptible of embodiment in various ways, and for explanation will be detems. Other embodiments form the subject mat- .ter of a divisional application, Serial No. 25,152 filed June 5, 1935.

In the drawings,

.. Fig. 1 is a view partly in section, and diagrammatic incharacter, showing a pneumatic installation for one room connected to the pressure fluid sources.

Fig. 2 is a front elevation ,of the relay shown in section in Fig. 1.

Fig. 3 is a frontelevation of the reversible thermostatic unit shown in partial section in Fig. 1.

Fig. 4 is a diagram showing how the equipment of Fig. 1 is connected to control the temperature in a plurality of rooms.

Referring first to Figs. 1, 2 and 3, the room installation includes a radiator valve with pneumatic motor, and a leak port thermostat having 1932, Serial No. 636,418

two reversely acting thermostatic elements which become selectively operative according as one or another supply pressure is established in the air supply line. I prefer to interpose between the leak port thermostat and the radiator valve mo- 5 tor a relay to accelerate the efiect of opening and closing of the leak port on the valve motor, but systems omitting the relay are known and the relay is not indispensable.

The leak port thermostat is generally indicated by the numeral H and has a base frame I 2 on which is mounted a minutely apertured leak port l3 and a coacting valve member l4 pivoted atl5 and yieldingly urged in an opening direction by any suitable means such as a weight I8. When swinging clockwise in opposition to the action of weight l6, valve l4 seals the end of leak port l3. The valve I4 is actuated selectively by two bi-. metallic thermostatic bars I! and I8 which-operate in reverse senses. Bar I! which controls heating effect, flexes to close the valve on rise of temperature, while bar 18, which controls cooling efl'ect, flexes to close the valve on fall of temperature.

The bars are independently adjustable, each being mounted on an independent pivotally ad- 'J'ustable base of known form. Bar I1 is mounted on base l9, pivoted on a horizontal axis at 2| and adjustable by stop-screw 22 with indicating pointer 23. Bar I 8 is mounted on base 24 pivoted at 25 in a horizontal axis and adjustable by screw 26 with indicating pointer 21. The stop screws limit the motion of the bars inward (towardvalve l4) and springs not visible in the drawings, are used to hold the bases against the stop screws. 85 This mode of adjusting such bars is well known in the art. (See Fortier 1,597,350 August 24, 1926). 1

The bar I! carries near its upper end a boss 28 and the bar l8 carries a similar boss 29 which are alternately'engaged respectively by cams 3|, 32, on shaft 33 rotatably supported by frame II. A crank pin 34 on cam 32 engages in a longitudinal slot in the end of lever 35 which is pivoted at 36 on base I2, so that when lever 35 swings outward from the position shown in Fig- 1, cams 3| and 32 turn clockwise. In Fig. 1 bar I1 is active and bar I8 is inactive, being held out by the engagement of cam 32 with boss 29. If the cams be rotated clockwise, cam 3| engagest boss 28, forcing bar I! to inactive position while cam 32 clears boss 29 and allows bar l8 to move in to active position.

The lever 35 is drawn inward by two tension springs 31 each connected to the end of a corre- Ell sup ly Th vav val o e so 45 bellows ii 0 connected to 10* valve ll control static bars ll l.) 1.) to lei:

The

iol'cecl closes. by lows motor ill.

The val e and as of a well While, as so A crate accor the pressure in this motor at a low the rate of s it is preferred to l3 and the radi venting or progl ive tion I have chosen in the Otto Eat l a tilt w operates st valve connected to the valve motor pressed air to and there is a relatively responds to ti e pres ure "a a relatively smaller die to the pressure in chamber l l. tween the diaphragms is vented means of atmospheric ports Connected to the centers of the two cliaphragms and causing them to move together is a ported hub structure ii! which an 2 'al port vented to the space between the wo diaphragms, which, as stated, is at atirlc ic pressure. spring urged conical valve c ts with the end of the axial port in the huh to control exhaust from the chamber 55, and also coacts with a seat llil in the body of the valve to control supply of cornpressed air from a passage to the chamber The compression spring assists the pressure acting in the chamber The leak port i3 is connected by a pipe 63 and passage 64 with the chamber Further, the passage H which is connected by a pipe 65 with the supply line 43 is connected by Way of an ad justable throttle valve v the chamber 53. The valve 66 is so adjusted the supply of air to the chamber it past the va ve is less than. the venting capacity when ains its greatest utilit .ysteros in which a 13111119.. controlled or a i: Lll F'lOSlJZltS. e co hection' are i in this v.

ere-rice to so, ply pipes l 3 valve c bars conditions, controls to cl is placed in control.

ory valve on fall oi. ten oe It will be observed that the o2 er tlehtly adjust e and that the shirt "e to another Pot only reverse "hay change osta-t operates to 'i il'iis useful feature, I ule the temperatu e rnairltai ier is somevll'iat higher maintained, by lice-ti? in winter, If

to maintain liiorm ter perature loader "ooth conditions, the thermost hars may he jotstecl accordingly.

While a particular emhori at has been described in considerable detail, modifications are possible Within the scope of the invention.

What is claimed is,-

l. The combination of regulating means for controlling the flow of heat exchanging medium; pneumatic motor means for actuating said regulating means; thermostatic valve mechacontrolling he flow of heat exchanging medium; 7

pneumatic motor means for actuating said regulating means; a thermostatic valve mechanism including two thermally responsive elements ar ranged to respond in reverse senses to temperature changes; means for renderin aid elememes merits selectively operative to control seid tor means.

4. The combination of regulating means for controlling the flow of heat exchanging medium; pneumatic motor means for actuating said 'regu lating means; a thermostatic valve mechanism including two thermally responsive elements ar= ranged to respond in reverse senses to temperew ture changes; and pressure actuated eens for rendering said elements selectively operative to control said motor means.

5. The combination of regulating means for controlling the flow oi heat exchanging medium; pneumatic motor means for actuating said regu= lating means: a thermostatic valve mechanism including two thermally responsive elements arranged to respond in reverse sensesto temperature changes; means for rendering said elements selectively operative to control said motor. means;

4 and means for individually adjust said then 1 responsive elements to e their peratures of response.

6. The combination of a pity of sting means eech controlling the flow of heat exchang medium. to a corresponding point of use; a plurality oi theostatic devices of the pnetic leak port type, one for each of said regulating means, said thermostatic devices each including two tiieiv responsive elements arranged to respond in relatively reverse senses to the e teperetin'e change; and a controlling device coon to all said thermostatic devices and in.- cluding means responsive to the pressure of pneumatic suppiv and ictioning to place the thermally responsive elements selectively in com is trolling relations with the corresponding regulatmeens, and means for v the pressure of nnetie supply. 

